What is Nutrition in Plants Class 7: Complete Guide for NCERT Students

Definition of Nutrition in Plants for Class 7

Nutrition in plants is the process by which plants prepare or obtain food to meet their energy and growth needs. Unlike animals, plants can make their own food using sunlight, water, and carbon dioxide. This self-feeding process is called autotrophic nutrition. Some plants, however, obtain food from other sources, showing heterotrophic nutrition. Understanding these types helps Class 7 students grasp how plants survive and grow.

Types of Nutrition in Plants Explained

Plants exhibit mainly two types of nutrition:

• Autotrophic Nutrition: Plants prepare their own food using sunlight, water, and carbon dioxide through photosynthesis.
• Heterotrophic Nutrition: Plants depend on other organisms for food. This includes:
• Parasitic plants (e.g., Cuscuta) that take nutrients from host plants.
• Saprotrophic plants (e.g., fungi) that feed on dead organic matter.
• Insectivorous plants (e.g., Venus flytrap) that trap insects for nutrients.

Each type plays a unique role in the plant kingdom.

How Photosynthesis Works: The Food-Making Process

Photosynthesis is the process by which green plants make food using sunlight, water, and carbon dioxide. It mainly occurs in the leaves containing chlorophyll.

The basic formula is:

$$6CO_2 + 6H_2O + light ightarrow C_6H_{12}O_6 + 6O_2$$

Where:

• $CO_2$ = Carbon dioxide
• $H_2O$ = Water
• $C_6H_{12}O_6$ = Glucose (plant food)
• $O_2$ = Oxygen released

Leaves absorb sunlight and carbon dioxide, roots absorb water, and chlorophyll helps convert these into glucose and oxygen. This glucose provides energy for growth and development.

Comparing Autotrophic and Heterotrophic Nutrition

Here is a comparison table to help understand the key differences:

This comparison helps Class 7 students identify nutrition types in plants clearly.

Parasitic and Saprotrophic Nutrition in Plants

Some plants cannot make their own food and depend on others:

• Parasitic Plants: These plants attach to host plants and extract water and nutrients. Example: Cuscuta (Amarbel).
• Saprotrophic Plants: These feed on dead and decaying organic matter by secreting digestive enzymes. Example: Fungi like mushrooms.

These nutrition types show the diversity of survival strategies in plants beyond photosynthesis.

Importance of Nutrition in Plants for Class 7 Students

Understanding nutrition in plants is essential for Class 7 NCERT Science because:

• It explains how plants grow and survive.
• It introduces key biological processes like photosynthesis.
• It helps students learn about plant diversity and adaptations.
• It forms the basis for advanced topics in biology.

Clear knowledge of this chapter improves exam performance and builds a foundation for future science learning.